Loading…
The Cell in its Environment
4
Transcript
The main difference is that energy is required
1) Transport Proteins-
in the cell membrane, they "pick up"
molecules outside and carry them in.
2) Transport by Engulfing-
cell membrane surrounds a particle and engulfs it.
Active Transport
The movement of materials through a cell membrane using energy
There are two forms of Active Transport:
Examples:
- Diffusion
- Osmosis
Movement of materials without using energy.
Passive Transport
WHY ARE CELLS SO SMALL?!?!
The cell remains small so that there is a shorter distance from the cell membrane to cell parts, that way the substances that the cell takes in don't have to travel as far. When the cell becomes too big, it splits into 2 new cells.
The Cell
in its
Environment
Caused by molecules moving and colliding.
Main way that substances enter and leave a cell.
the process by which molecules tend to move from an area of higher concentration to an area of lower concentration.
Diffusion:
Important because cells cannot function without enough water
Diffusion of water molecules through a selectively permeable membrane.